test_monitoring: use ephemeral port, and verify on_accepted
test_monitoring: use ephemeral port, and verify on_accepted

AndreasBomholtz/rbczmq,ged/rbczmq,methodmissing/rbczmq,methodmissing/rbczmq,AndreasBomholtz/rbczmq,methodmissing/rbczmq,ged/rbczmq,ged/rbczmq